SharePoint Layered Architecture App

Ovidiu Becheş-Puia
  • SharePoint Layered Architecture App Ovidiu Becheş-Puia

    Do you use enterprise layer architecture when creating SharePoint solutions ? Can you give me a site project as example, where I can find a layered design ? (Interface/BL/DAL)

  • I use layered architecture in all my SharePoint solutions and treat SharePoint generally as the UI layer, keeping it very thin. Any logic goes into the business model and I have DAL wrappers to abstract away the List infrastructure (which also helps with testing).

    For a good read on layered architecture in ASP.NET check out this article here. It's ASP.NET and NHibernate, but the principles are the same. There's also a layered architecture sample in .NET here on CodePlex. Again, not SharePoint specific but the principles are the same.

    Keep the SharePoint UI thin and resist the temptation to start reading/writing to lists in your web part code. Treat it like a database (because it is!)

  • Agree with Bil.

    Web parts, web controls, application pages etc should only be the UI layer that calls into a layer that is agnostic of the original calling context; calling context could be an event receiver, console application, timer job, workflow, etc. Always ensure that this shared layer you call into does not have a dependency on SPContext.Current since it isn't always there! Accept SPWebs, SPLists, SPLisItems etc as method parameters and constructor parameters. In a web context you can pass these from the SPContext.Current, but in a Console Application you would construct these yourself.

    To improve ease of debugging (just press F5) and shorten the developer feedback cycle, I often start off writing a simple Console Application which calls into the layer that will contain the core logic, passing in an SPWeb which I constructed in the Console Application. Once the core logic is finished, I write a thin WebControl or WebPart to replace the Console app, read the SPWeb from the context instead of constructing it, set up event handlers etc.

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